Split-pattern molding-machine



W. P. KRAUSE.

SPLIT PATTERN MOLDING MACHINE.

APPLICATION FILED APR-12' 9U.

Patented Sept. 16, 1919.

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W. P. KRAUSE. SPLIT PATTERN MOLDING MACHINE.

APPLICATION FILED APR-12. I917.

Patented Sept. 16, 1919.

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W. P. KRAUSE. SPLIT PATTERN MOLDING MACHINE.

APPLICATION FILED APR. 12. 1917.

Patented Sept. 16, 1919.

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sTATEs PATENT OFFICE.

WILLIAM Pl KRA'USE, OF CHICAGO, ILLINOIS, ASSIGNOR T0 MUMFORID MOLDIIE NG MACHINE COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW J ERSEY.

SPLIT-PATTERN MOLDING-MACHINE.

' Application filed April i2.

To all whom it may concern:

Be it known that 1, WILLIAM P. Knnusn, a citizen of the United States, residing at Chicago, in the county of Cook and Stateof Illinois, have invented certain new and use ful Improvements in Split-Pattern Molding- Machines, of which the following is a specification.

This invention relates to improvements in split pattern molding machines and has for its principal object to prOVide in conjunction with such a machine new and improved means for lifting the flask frame and flask.

Another object consists in providing a new and improved valve-controlled means for the control of said flask-lifting 'device. These and other objects will be more fully set forth and described in the lEQllOWlIlg specification and shown in the accompanying drawings, in which- Figure 1 is a front elevation of a machine embodying my invention.

Fig. 2 is a rear elevation of he same.

Fig. 3 is a transverse. vertical section through a portion of the machine, the position of a flask and pattern being indicated in dotted lines.

Fig. 4 is a detail partially in section of one of the lifting guide cylinders and plungers and the main hydraulic reservoir.

Fig. 5 is a plan view of the flaskframe, pattern plate, and allied construction; and

Fig. 6. is a perspective of the ramming head construction.

Like numerals refer to. like elements throughout the drawings, in which 10 indicates, generally, the base of my machine, having the yoke arms 11 pivotally attached thereto carrying a crosshead 12 and squeezer head 13. The cylinder 14 is supported upon and attached to thebase 10 and projects upwardly therefrom, a coacting plunger 15 being reciprocably mounted therein, as indicated in Fig. 3. The previously described mechanism forms no part of my invention and represents, only a general construction herein. It will suffice to say that the cylinder 1 1 is of compound construction as is the plunger 15, as indicated in full and dotted lines in Fig. 3. In the operation of this specific machine, actuating fluid is admitted Specification of Letters ratent.

Patented Sept. 16, 1919. 1917. seri lno. 161,514.

beneath the plunger 15 to the bottom of the cylinder 14 from the duct 16 for squeezing operation, and air is admitted to the upper portion of the cylinder 14; beneath the enlarged corresponding portion of the plunger 15 from a duct 17 leading from a suitable jolt-ramming valve generally indicated by numeral 18 and exteriorly viewed and shown in Fig. 2. The actuating fluid for jolting is admitted to the valve 18 from duct or pipe 19, th operation and construction of the jolt-ramming valve needing no further mention herein, 1

To supply actuating fluid, such as air, under pressure for the squeezing and jolt-ramming operations of the machine, I provide a main supply duct 20 (see Fig. 1) feeding to the engineers valve 21, the same having an operating handle 21 for suitable manual actuation. The actuating fluid for squeezing, upon proper manipulation of the valve handle 21, is supplied and exhausted through the duct 16 previously mentioned. A manually operable valve, generally indicated by numeral 22, is provided to control the supply of actuating fluid from duct 20, through a duct or pipe 22? to the supply duct "19 which leads from the valve 22. An auxiliary duct or pipe 23 extends between the valve 22 and squeezing fluid duct 16-, as shown in Fig. 2, and flow therethrough is so controlled by valve 22 as to be permitted from beneath the squeezing portion of the plunger when the valve 22 is in position to permit supply of the jolt actuation fluid through duct 19, this auxiliary duct 23 being provided to permit flow of air to and from beneath the squeezing portion of the plunger 15 to prevent the formation of vacuum or compression therein during the actuation of the jolt-ramming mechanism; this feature also not being a portion of this invention but being generally described merely to further understand the functioning of the machine.

A ramming head 25 is provided (see Fig. 6), the same comprising a base portion 25 constructed and arranged to rest upon and be attached to the upper portion of plunger 15, see Fig. 3. Extending upwardly from the base 25 are the ramming head posts 25 and the vibrator frame pedestals 25, the lat ter being provided with lugs 25 in each of which when fully assembled are provided the upwardly projecting flask-engaging pins 26 and flask pin holes 27 for suitable engagement of h'alf flasks (see Fig. 5), one of which is indicated in dotted Iines in Fig. 3, and designated by numeral 28. The vibrator frame 29 is attached to the vibrator frame pedestals 25 by stud bolts 29" to permit the. slight-amount of play necessary for vibration, and when the machine is, assembled pattern screws, dowels, or the likeupon this vibrator frame 29, pattern late 30 in Fig 3 bei'Ilg ShO'Wn in dotted linesas carrying a half pattern 31, When. assembled, the upper urface of the pattern plate 30 lies flush with the upper surface of the lugs 25 as shown in Fig.3. I

Itwiil be apparent that in the operation of the machine'so far aS described, when the plunger 15 is actuated for jolt ramming the flask 28, pattern plate '30, together with the pattern carried thereby will be jolted until the supply of actuating fluid is out oif hy valve 22; this 0, aeration, of course, taking place after the hlling of the haltfiask 28 "with meldin and. As a final step in the eflecting of the molding operation, it is generally advisable to squeeze the sand in the flask, .and toattain this end squeezing fluid is supplied ben ath plunger 15 to raise the same andits lead, including the fla'slg and rannning head, until the presser head 13 is forced into contact with the sand to properly squ ze the same, after which the plunger is allowed to: drop to the position shown Fig. 3. v

After the'jolting and s ueezing has taken place, it is necessary to draw the pattern from the sand and flask, and for this purpose a flask supporting and lifting frame 35 is provided, see Fig. 5 for example, this frame being recessed or cut away to fit around the lugs 25 so that the half flask 28 will rest and be artially upported upon this frame 35 save for the portion which restsupon the lugs 25; When it is desired to draw thepattern, the frai'ne 3'5 is raised independently of and relative to the ran ming head structure through the medium of apai'r' of guide cylinders 40 which are bolt ed by means of suitable flanges 40 to the base of the rammi-ng'head, as shown in Fig. 1, at each end of the latter. Each of these guide cylinders 40 is provided with a pinnger or piston 4L1 recipro'ca-bly mounted ther in and projecting through suitable glands or stufiing here-s 4-0 at the top of the cylinder, see- Fig; 3', for example. These piu ngers 41 are flanged at their upper ends as indicated by 41 and such flanges are suitably belted or otherwise secured to the bottom of the plate 3O is secured by frame Each of these cylinders 4-0 is provided with a main fluid inlet i i-0" above the bottom thereof, a supply duct 42 leading to the inlet d0" in each of the cylinders 40. As will be seen from a scrutiny of F at, the plunger 41 fitting closely in tho cylinder 40 and resting adjacent the bottom thereof, a slight clearance being preferably "left at the bottom, the position of such plunger when at its lowermost position would serve to out 01f the supply of actuating fluid through the inlet 40 This would normally make the device inoperative, and to overcome such a result I provide the bleed or restricted passage 41-0 leading from the duct or passage 40? to communicate with the bot tom of the cylinder 40. The purpose of this construction is to provide w lat is in effect a two-stage power lift. In present day practice it is customary, in drawing the pattern from the mold, to provide what is known as a hand starting device, actuation of which by the molder serves to manually lift or start the flask from the pattern, during which movement vibration of the pattern plate is taking place. Hitherto, to the best of my knowledge, it has always been necessary for eflicient molding to provide band starting means for the first stage lift, after which hydraulic or other power hus been applied to complete the lifting. The reason for this has been that were the hydraulic or other power applied in full force the lift would be too sudden, and in many instances sand would cling to the pattern owing to the fact that the vibrator would not b ave had sufficient time to loosen any such clinging portions from the pattern. In the actuation of my device, whenth'e actuating fluid, such as oil, or the like, is forced through SHJPly duct 42 its admission to the cylinder 4d beheath the plun er 4L1 is restricted and the effective force thercofis reduced by having to pass throu h the bleed or restricted pas sage 40. This bleed passage having been constructedof proper size the efi'ect will be to so reduce the e'ifective force of the actuating fluid that a gentle or slow rise is imparted to the plunger 41 until the inlet 40 is uncovered by the plunger, at which time full effective force of the actuating fluid actuates the plunger 41 and the resultant rise thereof is more rapid and quick. This operation results in the necessary two-stage lift of the flask during the drawing. of the pattern. At the same time, both stages of the lifting or drawing are produced mechan- Ically or hydraulically in contra-distinction to the manual accomplishment of the first stage lift in present day construction and subsequent hydraulic lift or second stage. During the first lift, as stated above, itis advisable to vibrate the pattern plate, and for this purpose I have shown a, vibrator 50 attached to the under side of the vibrator frame 29, this vibratorbeing provided with actuating fluid such as air through the tube 51 in com munication with the fluid supply duct 20. To secure proper simultaneous actuation of the two plungers, I provide a reservoir 60 bolted through the medium of a flange 60 to the base of the ramming head, see Figs. 2 and 4, for example. This reservoir contains the supply of fluid such as oil or the like as indicated by numeral 60", see Fig; 1, a street I. 61 being threaded into engagement with the reservoir adjacent the top thereof to permit replenishing of the supply of fluid as a necessary, this L being provided with a filler cap or plug 61 see Fig. i. A fluid supply duct 62 projects upwardly through the bottom of the reservoir 60 and terminates in an open end at the top of the reservoir 60 above the surface of the liquid 60 just beneath the threaded plug 60. This duct or pipe 62- leads from the valve casing 63 in which is provided a suitable duct furnishing communication between the duct 62 and the supply duct 64 leading from the main air supply 20, see Figs. 1 and l. A valve, closed by a spring or the like not shown, normally prevents communication between the pipes or ducts 6-1 and 62. This valve is provided with a projecting stem 65 lying adjacent the hinged or pivoted flap 66 depending from the ramming head base and operable or engageable by the knee of the molder to de-' press the valve stem 65 to permit flow of air or other fluid from duct 64: through duct 62 into the reservoir 60 at the top thereof, whereupon the liquid 6O will be expelled or driven out through the ducts 42 which lead from the bottom of the reservoir 60 to the cylinders 40.

It will be apparent that when the molder is ready to lift the flask or draw the pattern, he may set the vibrator going and seize the handle of the half-flask with both hands and depress the flap 66 to actuate valve stem 65 to lift the plungers 4C1, whereupon the supporting frame 35 will be raised relative to the ramming head, pattern plate, etc., in the two-stage movement described above until the flask and mold is lifted clear of the pattern 31, when the molder may lift the flask and mold from the frame allowing the valve stem 65 to move to closed position by removing his knee from the flap 66, whereupon the weight of the supporting frame 35, plungers, etc., will result in the same dropping to rest or normal position, forcing theactuating liquid back into the reservoir the final movement to rest of the plungers being slowed down or decreased due to the restriction of flow of the fluid back through the ducts 40 as will be obvious.

By this valve control it will be clear that my construction enables the operator to utihas both hands for the grasping of the flask during the lifting thereof, a meritorious feature of this invention.

To dampen or partially check this lifting motion to prevent a jarring of the mold as the same approaches its upper limit of travel, I provide cylinders 70 provided with flanges 70 at their upper end, see Fig. 5, these flanges being bolted to the underside of the frame 35, one cylinder 7 0 being located at each end of the frame preferably. Located in each of these cylinders 70 is a coil spring 71 coiled around the stems or shanks 72 of the pistons 7 2 beneath the head thereof, said coil springs 71 also coacting with the bottom of the cylinders 70. The stems 72 of these plungers 72 are adjustably secured in the apertured lugs 25 projecting outwardly from the base of the ramming head 25 through the medium of set screws 73. It will be obvious that the lifting of the frame 35 will be partially resisted and checked by the coaction between the pistons 7 2, springs 71, and cylinders 70, this resistance increasing as the frame 35 moves upwardly farther from the lowermost or rest position. By means of set screws 7 3 the pistons 72 may be adjusted for patterns of different heights.

It is believed that the description of the operation of the mechanism described above needs no further amplification to render it clear to those skilled in the art.

It will be apparent that my invention is susceptible of many modifications and im* provements, and I do not wish to be restrict-- ed to the form shown and described beyond the scope of the appended claims.

What I claim is:

1. In a molding machine in combination, a flask supporting frame, means to lift said frame, said means comprising a cylinder, a plunger reciprooably mounted therein, a liquid containing reservoir, a duct leading from said reservoir to said cylinder and operable to transmit fluid from the former to the latter, means to force said flow of fluid, said means comprising a fluid supply duct constructed and arranged to supply actuating fluid to said reservoir, means to control said last-named fluid supply, said means comprising a valve in said fluid supplynorm-ally closing the same, and means to open said valve, said means comprising an actuating member constructed and arranged for actuation by the knee of an operator.

2. In a molding machine, in combination, a flask frame, fluid actuating means to lift said frame, said means comprising fluid actuated members, a fluid supply duct, a valve normally closing said duct, and means coacting with said valve for actuation by the knee or the like of an operator, said lastnamed means comprising a hinged flap memthe operator to contact With said valve por- 10 er. tion and move said valve to open position.

In a molding machine, in combination, In testimony whereof, I have subscribed a flask frame, fluid actuating means to lift 'my name.

said frame, said means comprising fluid actuated members, a fluid supply duct, a WILLIAM IXRAUSE valve normally closing said duct, said Valve Witnesses:

being provided with a projecting portion, F, C. HEINEMANN,

and a hinged flap operable by the knee of R; H. WOODLAND.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, I); G. 

